The life cycle of a man or woman is classified into various categories according to the age group they belong to. They are infancy, childhood, adolescence, adulthood and old age. The infants are those newborns falling in the age group of 0 to 24 months. Major neural developments happen during this period. Childhood can be classified as early childhood and late childhood. People falling in the category of age between 2 years to 5 years belong to early childhood. They can also be referred to as toddlers, as during this stage, the motor skills develop. Late childhood is that period when people are falling in the age group of 6 years to 8 years.

Similarly, the stage of adolescence can be classified into two types: preadolescence and late adolescence. The preadolescents are referred to those who are falling in the age group of 9 years to 12 years. They are also referred to as tweens or tweenagers in modern age. People falling in the category of age between 13 years and 19 years are referred to as teens, teenagers or adolescents. Basically, they are called teens because the numbers end with the phrase “teen”. It is believed that this is the transition phase for a child to become an adult.

The adolescence is always considered as a period, where special attention needs to be given to the young people. It is in the adolescence, when the person undergoes changes in terms of the following aspects: biological (the reproductive organs develop, thereby able to procreate), physical (puberty causing visible changes in the body), psychological (a state of mind when the person of not clear of their own decisions) and finally social (where the people around have greater expectations to succeed in academics).

Adulthood is the period when the people are falling in the category of 19 years to 60 years showing major psychological differences and maturity. Finally, old age is when the people cross 60 years of age. It should be noticed that most of these classifications are based on when some major physiological and psychological changes occur in one.

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